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aivan3 [116]
3 years ago
15

X² + 2x – 1 = 0 in English words.

Mathematics
2 answers:
Svet_ta [14]3 years ago
7 0

Answer:

x squared plus two times x minus one = zero.

Step-by-step explanation:

(This is a Quadratic equation in the variable x).

Doss [256]3 years ago
3 0

Answer:

One less than the sum of square of a number  and twice the number is 0

Step-by-step explanation:

x^2+ 2x - 1 = 0

x represents any number. x^2 represents square of a number

2x represents twice the number

x^2+2x can be written as sum of square of a number  and twice the number

x^2+2x-1

One less than the sum of square of a number  and twice the number

x^2+2x-1=0

One less than the sum of square of a number  and twice the number is 0

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An environmental scientist wants to use a 95% confidence interval to estimate the mean number of hours per day her solar panel r
MissTica

Answer:

a) The 95% confidence interval for the mean number of hours per day her solar panel receives direct sunlight is between 2.5 and 11.7.

b) The confidence interval is built from a sample of 48 days. However, we can be 95% sure that for all days, the mean number of hours per day her solar panel receives direct sunlight is between 2.5 and 11.7.

Step-by-step explanation:

We have the standard deviation for the sample. So we use the t-distribution to solve this question.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 48 - 1 = 47

95% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 47 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.95}{2} = 0.975. So we have T = 2.0117

The margin of error is:

M = T*s = 2.0117*2.3 = 4.6

In which s is the standard deviation of the sample.

The lower end of the interval is the sample mean subtracted by M. So it is 7.1 - 4.6 = 2.5 hours of sunlight per day

The upper end of the interval is the sample mean added to M. So it is 7.1 + 4.6 = 11.7 hours of sunlight per day

a) Compute the 95% confidence interval for the mean.

The 95% confidence interval for the mean number of hours per day her solar panel receives direct sunlight is between 2.5 and 11.7.

b) Explain your confidence interval from part (a) in context.

The confidence interval is built from a sample of 48 days. However, we can be 95% sure that for all days, the mean number of hours per day her solar panel receives direct sunlight is between 2.5 and 11.7.

6 0
3 years ago
How do you cancel down fractions
sashaice [31]
What are you looking for on youre paper what letter

7 0
3 years ago
Simplify (-x^2 – 28x + 7) + (-7x^2 + 14x + 8).
Anon25 [30]

Add numbers with the same amount of variables

-x^2 + (-7x^2) = -8x^2

– 28x (+ 14x )= -14x

7 (+ 8) = 15

-18x² - 14x + 15 is your answer

hope this helps

6 0
3 years ago
What integer values satisfy both inequalities?<br> -1 &lt; x ≤7<br> x &gt; 3
PIT_PIT [208]

Answer:

4,5,6,7

Step-by-step explanation:

-1 < x ≤7 ,  x > 3 means that 3 < x ≤ 7

6 0
3 years ago
PLEASE HELP ME I BEG YOU !!!
boyakko [2]
Hi,

f(x)=\log(x)   FALSE

f(x)=\log(x-4)+1  TRUE

→  f(x)=\log(x-2)

f(x)=\log(x+2)  FALSE

f(x)=2log(x)  TRUE
4 0
3 years ago
Read 2 more answers
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